If you look at the 30 year chart there are setbacks, as there are with all stocks. I think the fact that it is close to its 52 week high is positive as the economy isnt even at 3/4 steam, much less full steam.
If you are in it for short term and need the cash then taking profits now might not be a bad thing.
Having been long for 11 years I have been thru 3 splits and continued growth. I expect that trend will continue for longies.
GL, while I agree w/you, there is now so much DHR stock out there, that future splits are, in my view, out of the question. Just look at the issued and unissued stock (options, etc) added together to see what I mean.